2 * This file is part of DisOrder.
3 * Copyright (C) 2008 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file clients/playrtp-alsa.c
19 * @brief RTP player - ALSA support
21 * This has been rewritten to use the @ref alsabg.h interface and is therefore
22 * now closely modelled on @ref playrtp-coreaudio.c. Given a similar interface
23 * wrapping OSS the whole of playrtp could probably be greatly simplified.
28 #if HAVE_ALSA_ASOUNDLIB_H
31 #include <alsa/asoundlib.h>
33 #include <arpa/inet.h>
42 /** @brief Callback from alsa_bg_collect() */
43 static int playrtp_alsa_supply(void *dst,
44 unsigned supply_nsamples) {
45 unsigned samples_available;
46 const struct packet *p;
48 pthread_mutex_lock(&lock);
49 p = playrtp_next_packet();
50 if(p && contains(p, next_timestamp)) {
51 /* This packet is ready to play */
52 const uint32_t packet_end = p->timestamp + p->nsamples;
53 const uint32_t offset = next_timestamp - p->timestamp;
54 const uint16_t *src = (void *)(p->samples_raw + offset);
55 samples_available = packet_end - next_timestamp;
56 if(samples_available > supply_nsamples)
57 samples_available = supply_nsamples;
58 next_timestamp += samples_available;
59 memcpy(dst, src, samples_available * sizeof (int16_t));
60 /* We don't bother junking the packet - that'll be dealt with next time
63 /* No packet is ready to play (and there might be no packet at all) */
64 samples_available = p ? p->timestamp - next_timestamp : supply_nsamples;
65 if(samples_available > supply_nsamples)
66 samples_available = supply_nsamples;
67 /*info("infill %d", samples_available);*/
68 next_timestamp += samples_available;
69 /* Unlike Core Audio the buffer is not guaranteed to be 0-filled */
70 memset(dst, 0, samples_available * sizeof (int16_t));
72 pthread_mutex_unlock(&lock);
73 return samples_available;
76 void playrtp_alsa(void) {
77 alsa_bg_init(device ? device : "default",
79 pthread_mutex_lock(&lock);
81 /* Wait for the buffer to fill up a bit */
82 playrtp_fill_buffer();
83 /* Start playing now */
85 next_timestamp = pheap_first(&packets)->timestamp;
88 /* Wait until the buffer empties out */
89 while(nsamples >= minbuffer
91 && contains(pheap_first(&packets), next_timestamp))) {
92 pthread_cond_wait(&cond, &lock);
94 /* Stop playing for a bit until the buffer re-fills */